J/A+A/568/A81 WASP-117b photometry and radial velocities (Lendl+, 2014)
WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit.
Lendl M., Triaud A.H.M.J., Anderson D.R., Collier-Cameron A., Delrez L.,
Doyle A.P., Gillon M., Hellier C., Jehin E., Maxted P.F.L.,
Neveu-VanMalle M., Pepe F., Pollacco D., Queloz D., Segransan D.,
Smalley B., Smith A.M.S., Udry S., Van Grootel V., West R.
<Astron. Astrophys. 568, A81 (2014)>
=2014A&A...568A..81L 2014A&A...568A..81L
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry ;
Radial velocities
Keywords: planetary systems - stars: individual: WASP-117 -
techniques: spectroscopic - techniques: photometric
Abstract:
We report the discovery of WASP-117b, the first planet with a period
beyond 10 days found by the WASP survey. The planet has a mass of
Mp=0.2755(± 0.0089)Mjup, a radius of
Rp=1.021(-0.065/+0.076)Rjup and is in an eccentric
(e=0.302(±0.023)), P=10.02165(±0.00055)d orbit around a
main-sequence F9 star. The host star's brightness (V=10.15mag) makes
WASP-117 a good target for follow-up observations, and with a
periastron planetary equilibrium temperature of Teq=1225(-39/+36)K
and a low planetary mean density (rhop=0.259(-0.048/+0.054)rhojup)
it is one of the best targets for transmission spectroscopy among
planets with periods around 10 days. From a measurement of the
Rossiter-McLaughlin effect, we infer a projected angle between the
planetary orbit and stellar spin axes of beta=-44(±11)°, and we
further derive an orbital obliquity of psi=69.6(+4.7/-4.1)°. Owing
to the large orbital separation, tidal forces causing orbital
circularization and realignment of the planetary orbit with the
stellar plane are weak, having had little impact on the planetary
orbit over the system lifetime. WASP-117b joins a small sample of
transiting giant planets with well characterized orbits at periods
above ∼8-days.
Description:
We present photometric time-series obtained with EulerCam and TRAPPIST
during one and four transits of WASP-117, respectively. We also
present radial velocity data from CORALIE and HARPS used to
characterize the planetary orbit.
Objects:
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RA (2000) DE Designation(s)
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02 27 06.09 -50 17 04.3 WASP-117 = GSC 08055-00876
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rv_coral.dat 57 65 CORALIE radial velocities
rv_harps.dat 57 53 HARPS radial velocities
ph_ecam.dat 77 411 EulerCam relative photometry (r'-Gunn filter)
ph_trapp.dat 77 5023 TRAPPIST relative photometry (I+z' filter)
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Byte-by-byte Description of file: ph_ecam.dat ph_trapp.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date (HJD-2450000)
14- 21 F8.6 --- Flux Normalized Flux
24- 31 F8.6 --- e_Flux Normalized Flux error
33- 39 F7.3 pix xshift Pixel shift in x-direction
41- 47 F7.3 pix yshift Pixel shift in y-direction
51- 55 F5.3 --- AM Airmass
58- 63 F6.3 pix FWHM Stellar Full-Width at Half Maximum
66- 71 F6.2 --- Sky Sky level (Flux)
73- 77 F5.2 s Texp Exposure time
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Byte-by-byte Description of file: rv_coral.dat rv_harps.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian Date (BJD-2450000)
13- 21 F9.5 km/s RV Radial velocity
25- 31 F7.5 km/s e_RV Radial velocity error (photon noise)
35- 41 F7.5 km/s FWHM CCF Full Width Half Maximum
44- 51 F8.5 km/s Span Bisector span
54- 57 I4 s Texp Exposure time
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Acknowledgements:
Monika Lendl, monika.lendl(at)ulg.ac.be
History:
* 23-Aug-2014: First on-linw versio
* 28-Jan-2016: Files rv_coral.dat and rv_harps.dat corrected (from author)
(End) Patricia Vannier [CDS] 05-Aug-2014